Short tip, the problem is only Safari here - the new Internet Explorer 
So yes, Safari doesn’t support some RegEx features that other browsers support. Now, without seeing the project, I can’t comment where exactly in your project you might be using a RegEx, but you might want to change that. If changing it is not possible, you would need to find an alternative approach altogether.
If you don’t use a RegEx in your code, it’s one of your libraries causing issues - so you’d have to check each of your dependency to see which one is actually adding the RegEx. I’d recommend checking a list of GitHub issues for all of those dependencies to find which one is the problem. There could be a solution already, or you might have to change your dependency.